maska

/maska/

Cases

SingularPluralWhen to use it
nominativemaskathe maskmaskalathe masksthe plain dictionary form — the doer of the sentence
genitivemaskanıthe mask'smaskalanıthe masks'the owner — whose it is
accusativemaskanıthe mask (as the object)maskalanıthe masks (as the object)a specific, known object — whom or what
dativemaskağato the maskmaskalağato the masksdirection or recipient — to where, to whom
locativemaskadaat / in the maskmaskaladaat / in the maskswhere it is; also having — mende bar, "I have it"
ablativemaskadanfrom the maskmaskaladanfrom the maskswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
mymaskammy maskmaskalarımmy masks
yourmaskangyour maskmaskalarıngyour masks
his / hermaskasıhis / her maskmaskalarıhis / her masks
ourmaskabızour maskmaskalarıbızour masks
you all'smaskağızyou all's maskmaskalarığızyou all's masks
theirmaskalarıtheir maskmaskalarıtheir masks

The overlap in the last rows is real, not a mistake: maskaları can mean "his / her masks", "their mask", or "their masks" — context decides.